Optically Worked Double Convex Glass Lens, 75mm Diameter, 250mm Focal Length StockedLY9121 Air-cooled rheostat at 125 ohms

Air-cooled rheostat at 125 ohms and 1

the frosted side acting as a screen for projected real-image observation

and displacement vessel for water-displacement experiments

and craniofacial anatomy teaching

Demonstrates that charge resides only on the outer surface of a conductor by inverting the charged net inside out and showing the charge transferring to the new outside layer

Optically Worked Double Convex Glass Lens, 75mm Diameter, 250mm Focal Length StockedLY9121 Air-cooled rheostat at 125 ohmsLong focal double convex glass lens at 75mm diameter and 250mm focal length, the f 3. 3 geometry stretching focal throw for distant screen projection of well formed real images.